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 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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SV101481.JPGSubwoofer Analogue Processor4512 viewsThis OP amp based subwoofer processor is a kit available from the local Jaycar electronics shop. There is a lot of soldering and construction so it is not hard to miss a few solder joints. I did. On the first few listens I can see there is a lot of tuning and balancing to be had. I am using a monoblock chip amp / gainclone to provide the final power.
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top1.jpgPush-Pull 6T9 Stereo Tube Amplifier4512 viewsThis is a project I started some time ago which was inspired by the Spare Time Gizmo's 6T9 Tube Amplifier Kit. I decided to make it push-pull using circuit ideas from my Eico HF-81 and my RCA Receiving tube manual. The combination wood and brass chassis came about when I found a small sheet of brass shoved under a cabinet and long forgotten about at work. It took a bit of work to clean it up and polish it to that shine! The wood is poplar purchased at Lowes, stained with Minwax Red Mahogany stain and finished with Amber Shellac.

Additional information: 6T9 Push-Pull Tube Amplifier
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Underneath.JPGJupiter Bees Wax and Paper Capacitors - OPA2134 Opamp Preamplifier4511 viewsWhen you get bored with high voltage valve amplifiers you start to look to other things to get your audio gear junky fix. I have always like the weird combos of materials in coupling/audio caps. I started with Jupiter Bees Wax and Paper caps and built a preamplifier around them. They are the dynamite sticks you can see. These are hand made and have silver connecting wire. Pure silver wire was used throughout and silver solder. Alps blue velvet attenuator and gold plated RCA add to a rich mix of components. The active bit is the Burr-Brown OPA2134 in milled sockets. Two sets of inputs are switchable and each channel has its own virtual power. This unit runs from a 26V 3.5A computer power pack. A timber suspended, tar and heavy Al foil dampened floor provides the base for the cct. brds. which sit on standoffs and are rubber grommet dampened. The lid and base of the thick die-cast aluminum case are also tar and foil lined.
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Fostex-GK120-Speakers-with-F120A.jpgFostex GK120 Speakers with F120A4474 viewsHello - this is a hard to locate set of speakers! The cabinet is a rare speaker enclosure from Fostex - model GK120. The speaker in each cabinet is the famous F120A. The set operates flawlessly - both aesthetically as well as acoustically. The wood (though I do not know the type) is solid and very nice. The enclosures themselves are made of a see-through Lucite and are definitely a conversion piece.
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STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit-Chassis.jpgSTA1 DIY Tube Preamp Kit (12AU7/ECC82)4473 viewsThis is my finished STA1 tube preamp kit from Lighthouse Electric. This design uses three 12AU7 tubes. I prefer the 12AX7 tube preamp kit that I built over the STA1.
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S5-K16LS-Tube-Amp-Kit-Mahogany.jpgK-16LS Tube Amp Kit (16W)4473 viewsThe S-5 Electronics K-16LS tube amplifier kit built into a Mahogany case. The tube amp kit was built with all the mods outlined in the forums here at diyAudioProjects.com. The circuit board was built with components (except the tube sockets) on the bottom side so just the tubes would be exposed. The front driver tubes is lit red with LEDs.

Charlie Mooradian
USA
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Audio-Research-VS55-Tube-Amp.jpgAudio Research VS55 Tube Amplifier4468 viewsAudio Research VS55 tube amp. I didn’t buy this amp, but had it in my house for some listening tests. Quite impressive, but has a lot of background noise. Uses EH 6550 valves.
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EL84-SE-Tube-Amplifier.jpgEL84 SE Tube Amplifier Project4460 viewsThis is my Single Ended EL84 / 6BQ5 Tube Amplifier project. See my webpage for the schematic. Half of a double triode tube (ECC88 / 6DJ8 or ECC82) amplify the input signal for each the EL84 / 6BQ5 tubes. The speakers in the background are also DIY and use a single Panasonic fullrange driver.
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DIY-5687-Tube-Preamp-Rear.jpgDIY 5687 Tube Preamp - Rear View4459 viewsRear view of my first 5687 tube preamp project. It sounds great for such a simple preamp.
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Fostex-FE206En-Double-Bass-Reflex-Speakers.jpgFostex FE206En Double Bass-Reflex Speakers4449 viewsThe finish is satin black stipple and the grills are held in place with four rare earth button magnets. Easy to pop on and off. The stipple effect was produced with a roller going over the fresh paint a number of times as it dried. The drivers huge magnets have bitumanised aluminum foil dampening attached and the internal wiring is two stands of lightly twisted wire wrap wire to each binding post. The top chamber is lined (but not stuffed) with Dacron but the bottom chamber is empty. There is no crossover in these fullrange speakers. Efficiency is 96dB at 8ohms impedance so they work well with flea power tube amps. Sitting higher than the tweeter (wizzer cone) the sound is quite natural with just a touch of forwardness in the mid-range. The speakers not only look stunning they sound excellent for a $500 spend.

For full details see the Fostex FE206En Double Bass-Reflex Speaker project page.

Mark Houston – retro-thermionic
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Wooden-5687-Valve-Preamplifier.jpg5687 Valve Line Preamplifier4417 viewsThis is the second DIY 5687 Valve Preamplifier that I built. The enclosure is a DIY wooden box and painted black.
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DIY-KT88-SE-Tube-Amplifier.jpgKT88 Single Ended Tube Amp Build4414 viewsRear view of the KT88 Single Ended Tube Amplifier. The circuit is just like Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.

Additional information and pictures are available on my build log for this project: SE KT88 Tube Amp.
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00097.jpgEI Trans and rectifier4394 viewsStill in the building process, the EI transformer (24VCT @ 6amps) and the rectifiers (MUR860 diodes) and two 10000uF caps.
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YAHA-Headphone-Amp.jpgYAHA Headphone Amplifier4389 viewsHere is on of my YAHA builds, I have never been a fan of Altoid tins. Later I used the Yaha voltage gain stage in my 12AU7 Tube / IRF612 MOSFET Hybrid Headphone Amplifier project.
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6C33C-6S33S-Single-Ended-Valve-Amplifier.jpg6C33C (6S33S) Single-Ended Valve Amplifier4385 views6C33C (6S33S) Single-Ended Valve Amplifier with 6E5P preamp valves. The power supply is external to the amplifier. Additional details for this valve amplifier are available in the 6C33C Tube Amplifier thread.
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DIY-LM3875-Gainclone~0.jpgDIY LM3875 Gainclone - rear view4368 viewsA gainclone chip amp with an external power supply. The design is based on my Roasting Pan LM3875 Gainclone Chip Amplifier. All wiring is point-to-point.
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DIY-KT88-Single-Ended-Tube-Amp~1.jpgDIY KT88 Single Ended Tube Amp4335 viewsFront view of my KT88 Single Ended Tube Amplifier. The circuit follows Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.

Additional information and pictures for this project are available on my build log: SE KT88 Tube Amp.
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PB220014.JPGPCL86 Single-Ended Amplifier4328 viewsSingle-ended amplifier using PCL86 triode / pentode tube

web: http://www.bartech.rulz.hu/
e-mail: kisskozsa@freemail.hu
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OwenSpecialFront.JPGThe Owen Gainclone Special4327 viewsI was commissioned to build my ex-boss a chip amp based on my Synergy LM3875 Gainclone Chip Amplifier. This has two LM3875 modules inside with Alps pot, 4oz solid brass volume knob, two 8000uF caps (red) and 1000uF low ESR line caps. Remote PS (left) has fast switch diodes (snubbed),160VA toroidal transformer. Both amp and PS are housed in die-cast cases and stand on solid brass cones. All point-to-point wiring.
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LidOff.JPG"not another chip amp"4306 viewsAfter the Synergy Gainclone amp I promised myself I would not make another chip amp. The point-to-point gainclone amp modules were made twelve months ago but never got used. They comprise of the LM3875 and 10,000uF caps. The PS is rated 160VA with a scavenged microwave mains filter and a snubbed rec. bridge. The amp is compact and very loud with a full and very extended bass with small bookshelf speakers. You feel this amp could power a whole night club. Well it fills this house with clear clean music! And that is how it sounds -> clear and clean!
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